#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
const double eps = 1e-4;
typedef pair<double, string> PDI;

double a, b;

void bfs(){
	queue<PDI> q;
	q.push({a, ""});
	map<double, int> mp;
	while(q.size()){
		auto [x, u] = q.front();
		q.pop();
		if(fabs(x - b) <= eps){
			cout << u << '\n';
			return;
		}
		if(mp.count(x)) continue;
		mp[x] = 1;
		q.push({0.5 * x, u + '1'});
		q.push({0.5 * x + 0.5, u + '2'});
	} 
}
void solve(){
	cin >> a >> b;
	bfs();
}
//0.1212 0.7867
int main(){
	ios::sync_with_stdio(0);
	cin.tie(0), cout.tie(0);
	int t = 1;
//	cin >> t;
	while(t --){
		solve();
	}
	return 0;
}